The UGG Saela Icelandic Sweater Boot is an ideal choice for chilly days. This moisture-wicking ankle boot is features the Treadlite by UGG outsole for superior cushioning and traction, and an UGGpure wool insole, which offers comfort and warmth. 17mm UGGpure wool insole and heel lining Treadlite by UGG outsole Knit shaft: 51% acrylic, 25% wool, 21% nylon, 3% spandex Nylon binding Woven heel label with UGG logo Foldable shaft with snap fasteners.